.TH isupper 3 "" "" ""
.SH SYNOPSIS
isupper \- uppercase character predicate
.SH ANSI_SYNOPSIS
#include <ctype.h>
.br
int isupper(int 
.IR c );
.br
.SH TRAD_SYNOPSIS
#include <ctype.h>
.br
int isupper(
.IR c );
.br
.SH DESCRIPTION
.BR isupper 
is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for upper-case letters
(
.BR A --<<Z>>),
and 0 for other characters. It is defined only when
.BR isascii (<[c]>)
is true or 
.IR c 
is EOF.

You can use a compiled subroutine instead of the macro definition by
undefining the macro using `
.BR #undef isupper '.
.SH RETURNS
.BR isupper 
returns non-zero if 
.IR c 
is a upper case letter (A-Z).
.SH PORTABILITY
.BR isupper 
is ANSI C.

No supporting OS subroutines are required.
.SH SOURCE
src/newlib/libc/ctype/isupper.c
